CN111197777B - Flow distribution control method for central flue system of high-rise building - Google Patents

Flow distribution control method for central flue system of high-rise building Download PDF

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CN111197777B
CN111197777B CN201811373986.1A CN201811373986A CN111197777B CN 111197777 B CN111197777 B CN 111197777B CN 201811373986 A CN201811373986 A CN 201811373986A CN 111197777 B CN111197777 B CN 111197777B
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何立博
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Ningbo Fotile Kitchen Ware Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes
    • F24C15/2021—Arrangement or mounting of control or safety systems
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F17/00—Vertical ducts; Channels, e.g. for drainage
    • E04F17/02—Vertical ducts; Channels, e.g. for drainage for carrying away waste gases, e.g. flue gases; Building elements specially designed therefor, e.g. shaped bricks or sets thereof

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
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Abstract

A flow distribution control method for the central flue system of high-rise building includes setting the air outlet of each indoor unit to be communicated with the public flue by respective smoke tube, presetting target flow QL within target flow range [ Qx, Qd ], setting the motor of indoor unit to have current or power detection module, calculating the current actual flow by current gear or current detection of cooker hood, calculating the difference between current actual flow and target flow, and selecting and adjusting the gear of motor to make the current actual flow be controlled within target flow range. The whole control method can realize basic guarantee of effective air quantity and eliminate the difference of smoke exhaust effects of different floors, and through frequency conversion or gear shifting control of the indoor range hood, the control process is efficient and energy-saving, and the loss is less.

Description

Flow distribution control method for central flue system of high-rise building
Technical Field
The invention relates to a central flue system, in particular to a flow distribution control method of a central flue system of a high-rise building.
Background
At present, newly-built building floors in cities are generally higher and higher, and are mainly based on engineering fine decoration, and most high-rise residences adopt indoor range hoods, smoke pipes, check valves and public flues to be connected, so that oil smoke in a kitchen is discharged into the public flues through the smoke pipes by the indoor powered range hoods. The high-rise public flue is generally arranged at the top, the opening and closing condition of a range hood of a user can influence the outlet resistance of the system, the increase of the flue distance can lead to the increase of the loss along the way, and the exhaust resistance of the range hood on the building can lead to the increase of the exhaust resistance of the smoke on the building, so that the pressure distribution in the public flue is extremely uneven, the high-rise smoke exhaust effect is generally good, the large-pressure smoke exhaust effect of the bottom layer is poor, and particularly, the smoke exhaust effect of the bottom layer is worse in the cooking peak period. However, the cross-sectional area of the common flue channel is generally defined by building design specifications, and when the area of the flue channel cannot be increased, the flue is blocked by increasing the air volume, so that the flow speed and the noise of the whole flue system are increased.
Although the prior art discloses a scheme for controlling the smoke exhaust air volume of different floors within a certain range through the control of a valve, the scheme is characterized in that the on-way resistance generated by the length of a flue is replaced by increasing the local resistance of a valve plate in a high-rise building, and finally the balance of the total resistance system from the air outlets of different smoke exhaust machines to the top end is realized. Therefore, the control method realizes balanced flow regulation by increasing resistance through the outlet, has relatively large energy consumption, and is not efficient and energy-saving. In summary, the flow distribution control method of the range hood in the existing high-rise building needs to be further improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a high-rise building central flue system flow distribution control method which can realize the basic guarantee of effective air volume, saves energy in the control process and has high efficiency aiming at the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: the flow distribution control method of the high-rise building central flue system comprises indoor units arranged on different floors, air outlets of all the indoor units are communicated with a common flue through respective smoke pipes, and the ith gear pressure-flow relational expression of an indoor unit motor is Pi＝ai+biQ+ciQ2+diQ3The ith power-flow relation is Ni＝Ai+BiQ+ciQ2+diQ3The system resistance curve is P-SQ2The method is characterized in that: the motor of the indoor unit is provided with a current or power detection module, and the target flow QL of the indoor unit is preset to be [ Qx, Qd ]]The flow distribution control method comprises the following steps:
firstly, when a user of an indoor unit starts up, the indoor unit is operated at a default rotating speed or a gear;
secondly, detecting the current or power of the current operating gear, inquiring a corresponding power-flow relational expression coefficient through the current gear, and calculating the current actual flow Qm;
feeding back information such as starting up and current actual flow to a host of the central flue system, and determining whether to update the current target flow QL by the host according to the current starting up rate;
judging whether the deviation between the current actual flow and the target flow is within a set allowable range,
if the current time is within the allowable range, no adjustment is needed;
if the resistance is not in the allowable range, obtaining a current resistance coefficient S according to the pressure-flow relation and the system resistance curve;
judging the ratio relation of Qx/Qm, and adjusting the gear of the motor according to the ratio relation;
estimating the flow value according to the pressure-flow relation under the gear determined by the step five and the system resistance curve with known current resistance coefficient;
seventhly, judging whether the pre-estimated flow value is in the target flow range;
driving the driving motor to operate to a corresponding gear;
ninthly, reading the current or power after the stabilization time;
calculating an actual flow value and judging whether the flow value is adjusted to be within a target flow range;
Figure GDA0003067325780000021
and repeating the step III to the step III until the flow is adjusted to be within the target flow range.
Preferably, the judging process of the third step is as follows:
the host computer calculates the current on-time rate g and judges whether g is in the range of m, n,
if m is less than or equal to g and less than or equal to n, the target flow QL is unchanged;
if g is less than m, the target flow QL is increased;
if g > n, the target flow QL is adjusted smaller.
Preferably, the specific motor gear of step (v) is adjusted as follows:
if Qx/Qm is less than h, increasing by 1 gear;
if h is less than or equal to Qx/Qm is less than or equal to i, increasing 2 gears;
if i is less than Qx/Qm, increasing 3 gears;
if Qx/Qm is less than j, 1 gear is lowered;
if j is less than or equal to Qx/Qm is less than or equal to k, 2 gears are reduced;
if k is less than Qx/Qm, 3 gears are reduced;
wherein h, i, j, k are preset values.
Further preferably, the judging process in the step (c) is as follows:
if the current is within the target flow range, the driving motor is adjusted to an estimation gear;
if not, the drive motor is adjusted to 1 gear below or 1 gear above the estimated gear.
As a preferable scheme of the main machine, the main machine is an outdoor main machine with a booster fan, and the booster fan is arranged at the top of the public flue.
As another preferable scheme of the host, the host is one of the turned-on indoor units.
Compared with the prior art, the invention has the advantages that: the high-rise building flow distribution control method utilizes the current gear or current detection of the range hood to calculate the current actual flow, calculates the difference between the current actual flow and the target flow, and selects and adjusts the motor gear to control the current actual flow within the target flow range. The whole control method can realize basic guarantee of effective air quantity and eliminate the difference of smoke exhaust effects of different floors, and through frequency conversion or gear shifting control of the indoor range hood, the control process is efficient and energy-saving, and the loss is less.
Drawings
Fig. 1 is a graph of power (or current) -flow of any gear of an indoor unit according to an embodiment of the present invention;
fig. 2 is a schematic view of a pressure-flow curve and a system resistance curve of the indoor unit;
FIG. 3 is a schematic structural diagram of an embodiment of the present invention;
FIG. 4 is a schematic structural view of an indoor unit and a smoke tube according to an embodiment of the present invention;
FIG. 5 is a flow chart of a flow control method according to an embodiment of the present invention;
FIG. 6 is a flow chart illustrating a control of a fan rotation speed of an indoor unit according to an embodiment of the present invention;
FIG. 7 is a flow chart of a host target traffic adjustment process according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a topology of a master and a slave according to an embodiment of the present invention;
fig. 9 is a schematic diagram of another topology of the master and the slave according to the embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1 and fig. 2, the range hood in the same gear has different actual air volume due to different outlet resistances on different floors, the relationship between the air volume and the power or current can be obtained by fitting a cubic function, and the P-Q-N (static pressure, flow rate, power) values of the range hood in different gears or frequencies can be measured on an air volume test bench and fitted into a function or a matrix table to be built in a memory chip. Taking a certain range hood with two gears as an example, any one gear is shown in fig. 1, the corresponding relation between the flow and the power (or the current) is unique, and the test value can be N within a positive rangei＝Ai+BiQ+ciQ2+diQ3Fitting the expression. As shown in FIG. 2, the PQ curve corresponding to the gear position may be a cubic function Pi＝ai+biQ+ciQ2+diQ3Fitting expression (standard fixed rotation speed PQ curve is just needed twice, the rotation speed can be changed due to the change of the outlet resistance of the range hood, the coincidence degree is better by using a cubic function), and a system resistance curve is generally expressed by P-SQ2And (4) expressing.
As shown in fig. 3 to 7, the central flue system of the present embodiment includes indoor units 1 installed on different floors, i.e., range hoods, an air outlet of each indoor unit 1 is communicated with a common flue 3 through a respective smoke tube 2, a motor of the indoor unit 1 has a current or power detection module, and a target indoor unit flow QL is preset to be [ Qx, Qd ].
The flow distribution control method of the embodiment includes the following steps:
firstly, when a user of an indoor unit starts up, the indoor unit is operated at a default rotating speed or a gear;
secondly, detecting the current or power of the current operating gear, inquiring a corresponding power-flow relational expression coefficient through the current gear, and calculating the current actual flow Qm;
feeding back information such as starting up and current actual flow to a host of the central flue system, and determining whether to update the current target flow QL by the host according to the current starting up rate;
judging whether the deviation between the current actual flow and the target flow is within a set allowable range,
if the current time is within the allowable range, no adjustment is needed;
if the resistance is not in the allowable range, obtaining a current resistance coefficient S according to the pressure-flow relation and the system resistance curve;
judging the ratio relation of Qx/Qm, and adjusting the gear of the motor according to the ratio relation;
estimating the flow value according to the pressure-flow relation under the gear determined by the step five and the system resistance curve with known current resistance coefficient;
seventhly, judging whether the pre-estimated flow value is in the target flow range;
driving the driving motor to operate to a corresponding gear;
ninthly, reading the current or power after the stabilization time;
calculating an actual flow value and judging whether the flow value is adjusted to be within a target flow range;
Figure GDA0003067325780000041
and repeating the step III to the step III until the flow is adjusted to be within the target flow range.
Wherein, the judgment process of the step III is as follows:
the host computer calculates the current on-time rate g and judges whether g is in the range of m, n,
if m is less than or equal to g and less than or equal to n, the target flow QL is unchanged;
if g is less than m, the target flow QL is increased;
if g > n, the target flow QL is adjusted smaller.
The specific motor gear adjustment of step five is as follows:
if Qx/Qm is less than h, increasing by 1 gear;
if h is less than or equal to Qx/Qm is less than or equal to i, increasing 2 gears;
if i is less than Qx/Qm, increasing 3 gears;
if Qx/Qm is less than j, 1 gear is lowered;
if j is less than or equal to Qx/Qm is less than or equal to k, 2 gears are reduced;
if k is less than Qx/Qm, 3 gears are reduced;
wherein h, i, j, k are preset values.
The judgment process of the step (c) is as follows:
if the current is within the target flow range, the driving motor is adjusted to an estimation gear;
if the current is not within the target flow range, the driving motor is adjusted to be 1 gear lower than the estimated gear or 1 gear higher than the estimated gear
As can be seen from FIG. 6, the signal detected by the flow or pressure detection module is transmitted to the data analysis unit, the data analysis unit drives the motor through the frequency conversion or motor driving module, and then the rotating speed of the fan is adjusted, and the control process is the existing design and is not specifically described.
As shown in fig. 3 and 8, an outdoor main unit with a booster fan 4 is used as a main unit, and the booster fan 4 is installed on the top of the common flue 3.
As shown in fig. 9, one of the powered-on indoor units 1 serves as a master.
In summary, in the flow distribution control method of this embodiment, the indoor range hood adopts a multi-gear adjustable motor, a variable frequency or direct current speed-regulating motor to calculate the current actual flow value through the power or current of the current gear, and intelligently controls the actual air volume of the indoor range hood within a certain range (reducing the air volume of the high-rise range hood, thereby reducing the system resistance, increasing the air volume of the low-rise range hood, further ensuring that the oil smoke of each user is completely sucked, and reducing the problems of wind noise and easy blockage of the high-rise and smooth low-rise layers), further networking with the cloud of the flue range hood, increasing a cloud distribution coordination algorithm, coordinating the range of the target air volume according to the start-up rate, increasing the design air volume of each user's range hood under the condition of small start-up rate, preferentially ensuring the balance of the smoke exhaust air volume under the condition of high start-up rate, and reducing the rotation speed or gear of part of the high-rise and large air volume through the modes of frequency conversion and gear shifting, the rotating speed or the gear of the range hood with large low-level resistance is increased, the basic guarantee of effective air volume is realized, and the difference of smoke exhaust effects of different floors is eliminated.

Claims (6)

1. A flow distribution control method for a central flue system of a high-rise building comprises a host and indoor units (1) arranged on different floors, wherein an air outlet of each indoor unit (1) is communicated with a common flue (3) through respective smoke pipes (2), and the ith gear pressure-flow relation of an indoor unit motor is Pi＝ai+biQ+ciQ2+diQ3The ith power-flow relation is Ni＝Ai+BiQ+ciQ2+diQ3The system resistance curve is P-SQ2The method is characterized in that: the motor of the indoor unit is provided with a current or power detection module, and the target flow QL of the indoor unit is preset to be [ Qx, Qd ]]The flow distribution control method comprises the following steps:
firstly, when a user of an indoor unit starts up, the indoor unit is operated at a default rotating speed or a gear;
secondly, detecting the current or power of the current operating gear, inquiring the coefficient of a corresponding power-flow relational expression through the current gear, and calculating the current actual flow Qm;
feeding back information such as starting up and current actual flow to the host, and determining whether to update the current target flow QL by the host according to the current starting up rate;
judging whether the deviation between the current actual flow and the target flow is within a set allowable range,
if the current time is within the allowable range, no adjustment is needed;
if the resistance is not in the allowable range, obtaining a current resistance coefficient S according to the pressure-flow relation and the system resistance curve;
judging the ratio relation of Qx/Qm, and adjusting the gear of the motor according to the ratio relation;
estimating the flow value according to the pressure-flow relation under the gear determined by the step five and the system resistance curve with known current resistance coefficient;
seventhly, judging whether the pre-estimated flow value is in the target flow range;
driving the driving motor to operate to a corresponding gear;
ninthly, reading the current or power after the stabilization time;
calculating an actual flow value and judging whether the flow value is adjusted to be within a target flow range;
Figure FDA0003099336120000011
and repeating the step III to the step III until the flow is adjusted to be within the target flow range.
2. The method for controlling the flow distribution of the central flue system of the high-rise building according to claim 1, wherein the judgment process of the third step is as follows:
the host computer calculates the current on-time rate g and judges whether g is in the range of m, n,
if m is less than or equal to g and less than or equal to n, the target flow QL is unchanged;
if g is less than m, the target flow QL is increased;
if g > n, the target flow QL is adjusted smaller.
3. The flow distribution control method for the central flue system of high-rise buildings according to claim 1, characterized in that the specific motor gear in the fifth step is adjusted as follows:
if Qx/Qm is less than h, increasing by 1 gear;
if h is less than or equal to Qx/Qm is less than or equal to i, increasing 2 gears;
if i is less than Qx/Qm, increasing 3 gears;
if Qx/Qm is less than j, 1 gear is lowered;
if j is less than or equal to Qx/Qm is less than or equal to k, 2 gears are reduced;
if k is less than Qx/Qm, 3 gears are reduced;
wherein h, i, j, k are preset values.
4. The method as claimed in claim 1, wherein the determination in step (c) is as follows:
if the current is within the target flow range, the driving motor is adjusted to an estimation gear;
if not, the drive motor is adjusted to 1 gear below or 1 gear above the estimated gear.
5. The flow distribution control method for the central flue system of high-rise buildings according to any claim 1 to 4, characterized in that the host is an outdoor host with a booster fan (4), and the booster fan (4) is installed on the top of the common flue (3).
6. The method as claimed in any one of claims 1 to 4, wherein the host machine is one of the activated indoor machines (1).
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CN112178719B (en) * 2020-09-18 2023-05-09 华帝股份有限公司 Central flue system and air volume control method
CN113124441B (en) * 2021-05-31 2022-10-04 华帝股份有限公司 Method for obtaining gear of range hood, terminal, host and smoke collection and discharge fan system

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